uBlock Origin for Firefox

The best content blocker Chrome add-on is now also available for Firefox users. An efficient blocker: easy on memory and CPU footprint, and yet can load and enforce thousands more filters than other popular blockers out there.

As Mozilla plans to cut off legacy support from version 57 all add-ons that are not web extensions will not work in the popular web browser.

Work on a WebExtension version of uBlock Origin began back in October 2016. You could test version of this by downloading it from GitHub but this meant it was not signed at that point in time. If you wanted to try the new version you could only install it as a temporary add-on.

Scroll down the page until you find the Development Channel section (right at the bottom)

Click on Development Channel to expand it

Either click directly on the "add to Firefox" link to install the latest build - which is the WebExtension version of uBlock Origin", or click on "see complete development channel history" to list previous versions as well

Other things worth noting are:

The new version is a hybrid extension right now. It will show up as legacy in about:addons

script:contains filter do not work

cosmetic filters are limited as the browser's user styles cannot be used for that anymore

Users who are on the "legacy" dev channel will notice that the "dev channel will cease to work". These users need to install the new version manually